/*
Copyright (c) 2011, Sulaiman A. Mustafa
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name 'sigh.asia' nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE

TODO:
implement:
- fix initialize fix
- fix help message
- fix remove
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include <unistd.h>
#include <errno.h>

#include "stag.h"
#include "sllib.h"

#define STAG_FIND_FILES 0
#define STAG_FIND_TAGS 1

/*SQL*/
#define STAG_DB_SQL_FIND_START "select path, group_concat(tag, ' ') from tags "
#define STAG_DB_SQL_FIND_END "group by path;"
#define STAG_DB_SQL_ADD_CHECK "select * from tags where path=? and tag=?"
#define STAG_DB_SQL_ADD "insert into tags values(?, ?);"
#define STAG_DB_SQL_REMOVE_START "delete from tags where "
#define STAG_DB_SQL_GENERIC_ERROR_MESSAGE "SQL error (please submit a bug report)"
#define ASSERT_SQLITE(X, Y, Z)\
	if((X)!=SQLITE_OK){\
		fprintf(stderr, "<!> %s\n(SQL ERROR: %s)\n", (Y), sqlite3_errmsg(Z));\
		exit(1);\
	}

sqlite3 *db;
sqlite3_stmt *statement;

sqlite3* stag_db_sql_open(){
	sqlite3 *handle;
	char *buffer;
	
	if(!stagBaseDir){
		fprintf(stderr, 
		"Base directory not specified! Please fill in a bug report and how to \n"
		"reproduce the bug. Thank you.\n");
		exit(1);
	}
	buffer=initialize_string(stagBaseDir);
	//buffer=append_string(buffer, STAG_DIR_SEP);
	buffer=append_string(buffer, stagDatabase);
	if(sqlite3_open_v2(buffer, &handle, (STAG_IS_OPTION(STAG_OPTION_INITIALIZE))?(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE):(SQLITE_OPEN_READWRITE), NULL)!=SQLITE_OK){
		fprintf(stderr, 
		"Unable to find/open the tag database.\nSee help for more information.\n"
		"----\nFile: %s\nError: %s.\n----\n", buffer, sqlite3_errmsg(handle));
		exit(1);
	}
	if(STAG_IS_OPTION(STAG_OPTION_INITIALIZE)){
		ASSERT_SQLITE(sqlite3_prepare_v2(handle, "create table tags(path, tag)", -1, &statement, NULL), 
		"Error: Database already initialized.", handle)
		if(sqlite3_step(statement)!=SQLITE_DONE){
			fprintf(stderr, "<!> %s\n(SQL ERROR: %s)\n", "Error: Database already initialized.\n", sqlite3_errmsg(db));
			exit(1);
		}
		sqlite3_finalize(statement);
	}
	free_string(buffer);
	return handle;
}


int stag_db_mod(const char *filename){
	int i, j;
	char *local_sql_statement=NULL;

	
	if (stagOperation&STAG_OP_ADD){
		if(!filename){
			fprintf(stderr, "No filename supplied!\n");
			exit(1);
		}
		if(!stagTagCount){
			fprintf(stderr, "file without any tags supplied. ignoring...\n");
		}
		
		for(i=0;i<stagTagCount;++i){
			ASSERT_SQLITE(sqlite3_prepare_v2(db, STAG_DB_SQL_ADD_CHECK, -1, &statement, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
			ASSERT_SQLITE(sqlite3_bind_text(statement, 1, filename, -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
			ASSERT_SQLITE(sqlite3_bind_text(statement, 2, stagTagList[i], -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
			if (sqlite3_step(statement)==SQLITE_ROW){/*already in database*/
				sqlite3_finalize(statement);
				continue; 
			} 
			else{
				sqlite3_finalize(statement);
				ASSERT_SQLITE(sqlite3_prepare_v2(db, STAG_DB_SQL_ADD, -1, &statement, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				ASSERT_SQLITE(sqlite3_bind_text(statement, 1, filename, -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				ASSERT_SQLITE(sqlite3_bind_text(statement, 2, stagTagList[i], -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				if(sqlite3_step(statement)!=SQLITE_DONE){
					fprintf(stderr, "%s: %s\n", STAG_DB_SQL_GENERIC_ERROR_MESSAGE, sqlite3_errmsg(db));
					exit(1);
				}
				sqlite3_finalize(statement);
			}
			
		}
	}
	else if (stagOperation&STAG_OP_REMOVE){
		
		if (stagTagCount){
    		printf("1\n");
			for(i=0, j=1;i<stagTagCount;++i){
				local_sql_statement=initialize_string(STAG_DB_SQL_REMOVE_START);
				if (filename) local_sql_statement=append_string(local_sql_statement, "path=? and tag=?");
				else local_sql_statement=append_string(local_sql_statement, "tag=?");
				ASSERT_SQLITE(sqlite3_prepare_v2(db, local_sql_statement, -1, &statement, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				if (filename)	ASSERT_SQLITE(sqlite3_bind_text(statement, j++, filename, -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				ASSERT_SQLITE(sqlite3_bind_text(statement, j, stagTagList[i], -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				if(sqlite3_step(statement)!=SQLITE_DONE){
					fprintf(stderr, "%s: %s\n", STAG_DB_SQL_GENERIC_ERROR_MESSAGE, sqlite3_errmsg(db));
					exit(1);
				}
				sqlite3_finalize(statement);	
				free_string(local_sql_statement);		
			}
		}
		else{
			if (filename){
    			printf("2%s\n", filename);
				local_sql_statement=initialize_string(STAG_DB_SQL_REMOVE_START);
				local_sql_statement=append_string(local_sql_statement, "path=?");
				ASSERT_SQLITE(sqlite3_prepare_v2(db, local_sql_statement, -1, &statement, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				ASSERT_SQLITE(sqlite3_bind_text(statement, 1, filename, -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
				if(sqlite3_step(statement)!=SQLITE_DONE){
					fprintf(stderr, "%s: %s\n", STAG_DB_SQL_GENERIC_ERROR_MESSAGE, sqlite3_errmsg(db));
					exit(1);
				}
				sqlite3_finalize(statement);	
				free_string(local_sql_statement);
			}
		}
	}
	else{
		fprintf(stderr, "improper use of db_mod (invalid operation specified) aborting.\n");
		exit(1);
	}
	return 0;
}

struct stringlist* stag_db_find(char *filename){
	static char *local_sql_statement=NULL;
	static char *matching_file=NULL, *matching_tags=NULL;
	static struct stringlist llist[2];
	int i, offset=0;
	int status;

	if (!(stagOperation&STAG_OP_FIND)){
		fprintf(stderr, "improper use of db_find (invalid operation specified) aborting.\n");
		exit(1);	
	}

	/* 0. Memmory managment ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
	if(local_sql_statement) local_sql_statement=free_string(local_sql_statement);
	if(matching_file) matching_file=free_string(matching_file);
	if(matching_tags) matching_file=free_string(matching_file);

	free_stringlist(&(llist[STAG_FIND_FILES]));
	free_stringlist(&(llist[STAG_FIND_TAGS]));
	
	initialize_stringlist(&(llist[STAG_FIND_FILES]));
	initialize_stringlist(&(llist[STAG_FIND_TAGS]));

	/* 1. Building the sql statement ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
	local_sql_statement=initialize_string(STAG_DB_SQL_FIND_START);
	if(filename || stagTagCount) local_sql_statement=append_string(local_sql_statement, "where ");
	if(filename){
		local_sql_statement=append_string(local_sql_statement, "path=? ");
		if (stagTagCount) local_sql_statement=append_string(local_sql_statement, "or "); 
	}
	if(stagTagCount){
		for(i=0; i<stagTagCount; ++i){
			if(i) local_sql_statement=append_string(local_sql_statement, "or "); 
			local_sql_statement=append_string(local_sql_statement, "tag=? ");
		}
	}
	local_sql_statement=append_string(local_sql_statement, STAG_DB_SQL_FIND_END);
	ASSERT_SQLITE( sqlite3_prepare_v2(db, local_sql_statement, -1, &statement, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
	if(filename){
		ASSERT_SQLITE(sqlite3_bind_text(statement, 1, filename, -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db);
		offset=1;
	}
	else offset=0;
	for(i=0; i<stagTagCount; ++i){ /*filling in paramatric values*/
		ASSERT_SQLITE(sqlite3_bind_text(statement, i+offset+1, stagTagList[i], -1, NULL), STAG_DB_SQL_GENERIC_ERROR_MESSAGE, db)
	}
	
	/* 2. Fetching data from database  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/	
	while(1){
		status=sqlite3_step(statement);
		if(status==SQLITE_DONE) break;
		else if (status==SQLITE_ROW){
			matching_file=initialize_string(""); /*these string are freed along with the returned stringlist*/
			matching_file=append_string(matching_file, sqlite3_column_text(statement, 0));
			matching_tags=initialize_string("");
			matching_tags=append_string(matching_tags, sqlite3_column_text(statement, 1));
			
			add_sllib_string_to_stringlist(&(llist[STAG_FIND_FILES]), matching_file);
			add_sllib_string_to_stringlist(&(llist[STAG_FIND_TAGS]), matching_tags);
		}
		else{
			fprintf(stderr, STAG_DB_SQL_GENERIC_ERROR_MESSAGE ": %s\n", sqlite3_errmsg(db));
			exit(1);
		}
	}
	/* 3. DONE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
	sqlite3_finalize(statement);
	return llist;
}

void stag_db_init(){
	db=stag_db_sql_open();
}


